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DataTrigger is not working

Question

I am trying to create a generic style for textblocks that shows negative numeric values in red. I was able to create a style that works with infragistics controls but I am unable to create a style that works with a textblock.

By the way I did read
this post however I am defining my styles in an application-level resource dictionary so I am unable to bind to a data element property name as is shown in the answer to the post.